68 lines
1.3 KiB
PHP
68 lines
1.3 KiB
PHP
<?php declare(strict_types=1);
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/**
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* This file is part of the Phootwork package.
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*
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* @license MIT License
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* @copyright Thomas Gossmann
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*/
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namespace phootwork\lang\parts;
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use InvalidArgumentException;
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/**
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* Internal Text methods
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*
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* @author Thomas Gossmann
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* @author Cristiano Cinotti
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*/
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trait InternalPart {
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abstract public function length(): int;
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/**
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* @internal
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*
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* @param int $offset
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*
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* @return int
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*/
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protected function prepareOffset(int $offset): int {
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$len = $this->length();
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if ($offset < -$len || $offset > $len) {
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throw new InvalidArgumentException("Offset must be in range [-$len, $len]");
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}
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if ($offset < 0) {
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$offset += $len;
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}
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return $offset;
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}
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/**
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* @param int $offset
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* @param int|null $length
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*
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* @return int
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*
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* @internal
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*
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*/
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protected function prepareLength(int $offset, ?int $length): int {
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$length = (null === $length) ? ($this->length() - $offset) : (
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($length < 0) ? ($length + $this->length() - $offset) : $length
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);
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if ($length < 0) {
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throw new InvalidArgumentException('Length too small');
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}
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if ($offset + $length > $this->length()) {
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throw new InvalidArgumentException('Length too large');
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}
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return $length;
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}
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}
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